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(A) DF STEM image from partially ascorbate reduced Pd salt/Brij 56 paste showing uniform distribution of 2–7 nm spherical Pd nanoparticles, x1.5M magnification. (B–I) DF STEM images of nanoparticle sintering event (enclosed in orange box in B) over 70 seconds, in 10-second intervals (same region as A, as indicated by purple square), x5M magnification.
